battery storage
 

I always leave my batteries in storage as i sometimes end up not being able to race for a couple weeks at a time. was curious if people discharge into storage voltage or charge into storage voltage, also if there is a distinct advantage for battery life one way or the other.

It depends at what you are using for your storage voltage. If that voltage is in the flatter part of the voltage/SOC curve (and it usually is), you are probably better off discharging to the storage voltage; this leaves you with more remaining capacity in the pack, which means you're that much closer to full the next time you want to use it and also provides you with a bit more "cushion" if there is any self-discharge of the pack.

At the end of the day I drive my cars to about 3.82-3.84v remaining per cell and place the packs in storage. No puffing.

I always store them at "storage" voltage per my icharger 308. Was more curious if there is an advantage in performance or battery life depending on charging them into storage voltage or discharging them to storage voltage.

Nope - what matters is the voltage of each cell when you're done. You basically are looking to get the voltage as low as possible in order to reduce the self-aging that occurs in most lithium chemistries, but not so low such that moderate self-discharge will cause the cell voltage to become excessively low. Many manufacturers will recommend storage at approximately 40-50% SOC, or roughly 3.6-3.7 V/cell.

Note that excessively high ambient temperature is by far and away your greatest concern when storing batteries. Try to keep them at a temperature no greater than 20C/68F if at all possible.